Advertisements
Advertisements
प्रश्न
What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?
उत्तर
Elements that are neither good nor bad conductors of electricity, are called semi conductors.
APPEARS IN
संबंधित प्रश्न
The inter-molecular force is maximum in
Solids have definite shape and definite volume.
Liquids have definite volume but do not have definite shape.
Fill in the blank :
The substances which can flow are called ________
In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?
When a crystal of potassium permanganate is placed at the bottom of water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of :
State any two properties for believing that aluminium is a metal.
What are (i) metals (ii) non-metals, and (iii) metalloids ? Give two examples each of metals, non-metals and metalloids.
9.72 g of potassium chloride dissolves in 30 g of water at 70°C. Calculate the solubility of potassium chloride at that temperature.
One of the following is a solid foam. This one is :
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
How would you obtain sodium chloride from a mixture of sodium chloride and sulphur without using water ?
Explain how, nitrogen , oxygen and argon gases are separated from air.
The material which is added to water during purification process at the water works so as to disinfect it is :
Asmita went to buy an earthen pot. There she saw many things kept for sale.
From what substance has the potter made all the things?
Define the term matter.
The particles in the matter are extremely small and can be seen even with a powerful microscope.
Liquids cannot be compressed and they have fixed volume.
Write scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.